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Anisotropic Magnetoresistance and Nontrivial Spin Hall Magnetoresistance in Pt/$α$-Fe$_2$O$_3$ Bilayers

To date, magnetic proximity effect (MPE) has only been conclusively observed in ferromagnet (FM) based systems. We report the observation of anomalous Hall effect and anisotropic magnetoresistance in angular dependent magnetoresistance (ADMR) measurements in Pt on antiferromagnetic (AF) $α$-Fe$_2$O$_3$(0001) epitaxial films at 10 K, which provide evidence for the MPE. The Néel order of $α$-Fe$_2$O$_3$ and the induced magnetization in Pt show a unique ADMR compared with all other FM and AF systems. A macrospin response model is established and can explain the AF spin configuration and all main ADMR features in the Pt/$α$-Fe$_2$O$_3$ bilayers.

preprint2022arXivOpen access
Yang ChengSisheng YuAdam S. AhmedMenglin ZhuJinwoo HwangFengyuan Yang
cond-mat.mtrl-sci
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Yang ChengSisheng YuAdam S. AhmedMenglin ZhuJinwoo HwangFengyuan Yang

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